Valve system for reversing-furnaces



APPLICATION FILED DEC. 21. I916.

- PatentedSept. 7,1920.

3 SHEETS-SHEET 1.

INVENTOR WITNESSES L. L. KNOX. VALVE- SYSTEM FOR BEVERSING FURNACES.

APPLICATION FILED DEC. 21. 1916- I 1,351,914. PatentedSept. 7, 1920.

' I 3ISHEETSSHEET 2.

o WITNESSES q] INVENTOR L. L. KNOX. VALVE SYSTEM FOR REVERSING FURNACE APPLICATION FILED 05021. 1916.

Patented Sept. 7, 1920. 3 SHEETSSHEET 3.

" "U T D TA-TES PATENT OFFICE.

LUTHintL. KNOX, or AVALON, PENNSYLVANIA, ASSIGNOR To BLAW-K OX ooMrnNY, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

10F PITTSBURGH,

vAIlvE SYSTEM FOR REvErtsINe-FURNAoEs.

Application filed December21, 1916. Serial No. 138,288.

Toall whom it may concern;

I Be ituknown that I, LUTHER L. KNOX, a citizen of the United States, residing at Avalon, Allegheny county, Pennsylvania,

7 5 have invented a new and useful Valve Systerm for Reversing-Furnaces, of which the following is'a full, clear, and exact description, reference being had to the accompany-,

' -ing drawings, forming. part of this specification, in which- Figure 1 1s a plan view showing a valve "system for reversingfurnaces embodying my invention, and Figs. 2 and'3 are sections taken on the lines II-II and III-III, respectively, of Fig; 1. I

My invention has relation to valve systems for reversing regenerative furnaces and is designed to provide operating mecha- 20. nism for the several gas and air valves which is positive in its action and simple and effective in its construction and arrangement. A further object is to provide mechanism of this character in which certain of the valves-may be operated in a definite time relation to each other. v

The nature of my invention will'be best understood byreference to the accompanying drawings in which I have shown the preferred embodiment thereof, and which will now be described, it being premised, however, that various changes can be made in the details of construction and arrangement of the several parts without departing from the spirit and scope of my invention asdefined in the appended claims.

In these drawings] the numeral 2 desig nates an air flue leading from one side of the valve structure to one of the air regenerators (not shown) of a reversing regenerative furnaceg and 2 a similar flue lead- 'fiigfffromit ljie'other side of the valve structure to the other air regenerator. 3 and 3 designate the 1gas flues leading from oppo- 45 site sides of t e valve structure to'the re- *"spective gas regenerators.

, fprovided with an air inlet valve-4 and an air- 2 is proreversing valve 5, and the flue vided with corresponding valves 4 and 5.

The gas fine 3 has the respective branches 6 and 7, the branch 6 having therein the gas reversing valve 8, and'the branch 7 having therein the gas inlet valve 9. The flue 5 has similar branches 6 and 7, provided with'gas reversing and inlet valves 8 and 9, respectively. 10 designates a gas inlet leading to one end of the valve structure and which communicates with both flue branches. 7 and 7. The branches 6 and .6

have a common connection 11 between the valves 8 and 8 leading to the stack connect1on 12 extending from the oppositeend of the valve structure. The two air flues 2 and 2 also connect with the flue 12 between the valves 5 and 5i. 13 designates a stack damper inthe stack connection 12. The valves 5 and 5 8 and 8, and 9 and are preferably of the vertically sliding type, such as Specification of Letters Patent. Patented Sept: 7, 192() v illustrated in Figs. 2 and 3, and may consist of hollow water cooled bodies. I also prefer to seat these valves obliquely across their respective flues.

The air inlet valves a and 4 ably.- of the mushroom type, such, for instance, as shown in Fig. 2. The details of the particular valves themselves form no part of my present invention.

I 14 designates an electric motor which is connected through suitable gearing 15,with a shaft 16. This shaft 16 carries'one double pulley 17, a second double pulley 18, and a third double pulley 1 9. 201s a cable which is connected at one end to one member ofthe double pulley 17 and which extends thence over a uide pulley 21 and down to a yoke 22 whic has a sliding lost motionengagement with the headed stem 23 of the air inlet valve 4E. Thepulley 21 is preferably mounted on the pivoted arm 21 having acontrol connection 21 leading to any suitare preferable form of manual control device. This connection 21 provides means whereby, by

raising or lowering the arm 21 the Opening movement of the valve 4' may be regulated, and also whereby said valve may be, if desired, operated manually. independently of its connections with the motor 14L 20 -is a similar cable leading fromthe other member of the double pulley 17 and connected to the valve 4* in the same manner that the cable 20 is connected to thevalve 4. v i

24 is a cable which is connected atone end to one end of the double pulley 18, passing thence -over the guide pulley 25 and connected at its opposite .endto the air reversing valve 5. A similar cable 24 is conmember of the double pulley 25 to the air reversing valve 5.

26 is a cable connected at one end to one member of the double pulley 19 and at its opposite end to the gas reversing valve 8.

26" is a similar cord or cable connected at one end to one member of the double pulley 19 and at its opposite end to the as reversing valve 8. 27 and 27 a are guide pulleys for the cables 26 and 26?, respectively.

28 designates another electric motor which is'connected by suitable gearing 29 with a double pulley 30. 31 is a cable connected to one member of the double pulley 30, passing thence over guide pulleys 32 and connected at its other end to the gas inlet con-- trol valve 9. 31 atione end to the ble pulley 30, passing over the guide pulleys 32, and connected at its other end to thegas inlet control valve 9. 33 is a counterweight which is hung on the cable 31 between the pulleys 30 and 32, and 33 is a similar counterweight hung on the cable 31*.

The operation is as follows: Supposing the several valves to be in the positions shown 1n Figs. 2 and 3, in which air and gas are passingto the furnace through the flues 2 tion are returning through the flues 2 and 3 and passing to the stack connection, and that it is desired to reverse the furnace :The motors 14 and 28 are energized, thereby actuating the several scribed to close the valves 5, 4 8 and 9*, and to open the valves 5, 8 and9. The air inlet valve 4' will also open as soon as the lost motion connection between the yoke 22 and the headed valve stem 23 is taken up by the movement of the cable 20.

By reference to F ig.-3 it will be noted that with the parts in the position which theyoccupy prior to the reversal just described, the cable 31 has considerable slack between the pulleys 30 and 32, and that the counterweight 33 is in its lowermost'position, thiscounterweight being lighter than the. weight of the valve 9. 'lhe other counterweight 33, however, is in its raised position and the cable 31 is taut. Therefore, when the pulley 30 is operated the cable 31 is immediately slacked and the valve 9 at once commences to close. Beforeany operation of the valve9 it is first necessary for the pulley 30 to turn sufliciently to take up the slack in the cable.31 and raise thecounterweight. There will, therefore, be a certain time interval between the operation of the two valves 9 and 9,'the valve 9 being stantially closed before the'valve open. In this manner no gas is the flue 3 until the other valves of the sys-" tem have been closed, while at thesame time the gas which has been passing to the flue 3 passing into the furnace.

is a similar cable connected.

other member of the dou- -fiues leading to opposite each "of the air flues having, anair inletand 3 and the products of combus-' valve connections desub-i 9 begins to admitted to":

scribe is immediately closed off when the valves start to reverse. There results a mi imum loss of I to its being carried. into the stack without The advantages of my invention result from the means for-mechanically operating the sev gas during the reversing period, due

provision of simple and positive eral valves through the medium of motors which maybe controlled in any desired manner. Also from the provision of means just described 'whereby a time interval elapses between the closing of one gas inlet control valve andthe opening of the other gas inlet control valve. By thefidescribed arrangement, all the valves may beoperated by simple conne't'jtions from two motors.

Itwill be readily understood that the particula'r connections between the valves. and the motors may the p be changed in various ways; details of construction of the valves themselves may be changed, and that numer ous other changes may be made within the I scope of the'ap'pendedclaims. I claim: 1. Ina valve system of scribed, the combination with air and gas 'valv es, a second actuating device for the gas lnlet valves, lostmotion devices between their, actuating the air, inlet valves and mechanism, and'lost motion devices between the gas inlet valves and their actuating devices, said shaft and actuating devices being the character deends-of the furnace,

ga sreversing valve,

arranged to permit the operation of the several recited *va'lvesin predetermined sequence, substantially as described. v

2. In' a valve system of the character described, the combination with air and gas flues, leading to opposite ends of a furnace, each ofthe air flues having an air inlet valve and also an air gas .flues' having a gas reversing valve, an

reversing valve, each of the actuating device for all of-said valves, lost motion connections between said actuating devices and the air 111161, valves, arranged to cause the air inlet. valves and the reversing valves to be operated in a predetermined sequence, gas inlet valves for the gas fiues, and a sep'arateoperating device for, actuatingthe gas inlet valves, there being sulficient lost motion in said actuating devices to permit the actuation of all of after'theone gas inlet valve has been" closed and before the other opened, substantially as described. I

In a valve system of'the characterdethecombination .with'air and gas the other valves gas inlet valve has been fiuesleading to opposite ends of the furnace, each of the air fines having an air inlet valve and an air reversing valve, and-each of the gas lines having a gas inlet control valve and gas reversing valve, a motive device, a shaft driven thereby, cables leading in opposite directions from said shaft and connected to the respective air inlet valves, an adjustable lost motion connec-- tion between each of the air inlet valves and their cable connections to permit the one valve to close before the other is opened when reversing the furnace, a second set of cables leading from said shaft and connected respectively to the two air reversing valves, a third set of cables connected to said shaft and-leading in opposite directions to the gas leading to the gas inlet control valves also having means for producing lost motion therein, said motive devices and connections being arranged to permit operation of the several valves in predetermined sequence,

substantially as described.

In testimony whereof, I have hereunto setmy hand.

. LUTHER L. KNOX. Vitnesses G120. H. PARMELEE, H. M. CoRwi'N. 

